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Registros recuperados: 15
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A priori estimation of accuracy and of the number of wells to be employed in limiting dilution assays BJMBR
Chaui-Berlinck,J.G.; Barbuto,J.A.M..
The use of limiting dilution assay (LDA) for assessing the frequency of responders in a cell population is a method extensively used by immunologists. A series of studies addressing the statistical method of choice in an LDA have been published. However, none of these studies has addressed the point of how many wells should be employed in a given assay. The objective of this study was to demonstrate how a researcher can predict the number of wells that should be employed in order to obtain results with a given accuracy, and, therefore, to help in choosing a better experimental design to fulfill one's expectations. We present the rationale underlying the expected relative error computation based on simple binomial distributions. A series of simulated in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Limiting dilution assay: accuracy; Wells; Number of; Relative error.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000800010
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Agro-well and pump diffusion in the dry zone of Sri Lanka: Past trends, present status and future prospects AgEcon
Kikuchi, Masao; Weligamage, Parakrama; Barker, Randolph; Samad, Madar; Kono, Hiroichi; Somaratne, H.M..
The use of shallow wells, equipped with small pumps, to lift groundwater has spread rapidly in many agricultural regions of tropical monsoonal Asia. In Sri Lanka, the rapid and pervasive invasion of agro-wells and pumps drew the attention of policymakers and researchers, but many questions were left unanswered due to lack of research in the area. This study aims to fill this gap in knowledge, based on observations and data obtained in field surveys conducted in major and minor irrigation schemes in the dry zone of Sri Lanka. This report gives the key findings of this study into the pattern, extent and causes of the spread and use of agro-wells and pumps in traditional villages and irrigated settlement schemes. It investigates farmer investments in...
Tipo: Report Palavras-chave: Wells; Construction technology; Pumps; Arid zones; Investment; Irrigation systems; Irrigation programs; Rice; Estimation; Agribusiness; Agricultural Finance; Crop Production/Industries; Financial Economics; Marketing; Public Economics.
Ano: 2003 URL: http://purl.umn.edu/44558
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China’s water pricing reforms for irrigation: effectiveness and impact AgEcon
Liao, Yongsong; Gao, Zhanyi; Bao, Ziyun; Huang, Qingwen; Feng, Guangzhi; Xu, Di; Cai, Jiabin; Han, Huijing; Wu, Weifeng.
Irrigation occupies a central position in China’s crop production. However, due to low per capita water resources, much worse, unevenly distributed over regions and time and the rapid increase of water diversions to non-irrigation sectors, irrigation water shortages have become a very serious problem. Without the adoption of effective measures this problem may even threaten China’s food security. Currently, irrigation efficiency is very low in general, irrigation water prices cannot fully recover water supply costs, and irrigation facilities are aging due to the lack of funding for O&M (operation & maintenance). Since water prices are regulated by the government, and not determined by the market, water prices did not work effectively in water...
Tipo: Working or Discussion Paper Palavras-chave: Water rates; Pricing; Price policy; Cost recovery; Farmers attitudes; Water rights; Water market; Water supply; User charges; Irrigation water; Water allocation; Irrigation management; Participatory management; Water conservation; Institutions; Organizations; Water users associations; Cereals; Yields; Models; Labor; Cost benefit analysis; Irrigation requirements; Investment; Groundwater management; Wells; Irrigation canals; Food security; Legal aspects; Crop Production/Industries; Farm Management; Food Security and Poverty; Production Economics; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/91872
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Developing effective institutions for water resources management: A case study in the Deduru Oya Basin, Sri Lanka AgEcon
Somaratne, Pallewatte G.; Jinapala, Kiribandage; Perera, L.R.; Ariyaratne, Badugodahewa Ranjith; Bandaragoda, Don Jayatissa; Makin, I.W..
Tipo: Working or Discussion Paper Palavras-chave: River basins; Water resource management; Water lifting; Wells; Domestic water; Population; Economic aspects; Income; Irrigation programs; Institutions; Policy; Groundwater; Agricultural development; Fish farming; Pumps; Ecology; Water supply; Drought; Poverty; Land use; Water scarcity; Natural resources; Agricultural production; Cropping systems; Agricultural and Food Policy; Agricultural Finance; Consumer/Household Economics; Crop Production/Industries; Food Security and Poverty; Institutional and Behavioral Economics; Land Economics/Use; Political Economy; Production Economics; Public Economics; Resource /Energy Economics and Policy.
Ano: 2003 URL: http://purl.umn.edu/92665
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Evaluation of occurrence of NO3-, coliform and atrazine in a karst aquifer, Colombo, PR. Repositório Alice
SCHLEDER, A. A.; PARRON, L. M.; HANSEL, F. A.; FROEHNER, S.; PALAGANO, L. T.; ROSA FILHO, E. F. da.
A vulnerabilidade de aquíferos do tipo cársticos à contaminação por atividades agropecuárias ocorre em função de sua estrutura geomorfológica. No entanto, existem poucos estudos desta natureza no Brasil. O objetivo deste estudo foi avaliar a ocorrência de nitrato, bactérias coliformes e atrazina em poços rasos e profundos no aquífero cárstico paranaense sob influência de atividades agrícolas. O estudo foi realizado em uma área de agricultura intensiva sobre aquífero cárstico da bacia hidrográfica do Alto Iguaçu/Ribeira no município de Colombo-PR. As campanhas amostrais foram realizadas no período entre 2014 e 2015 em 15 poços rasos e 7 poços profundos, para análise bacteriológica, de NO3- e de atrazina na água. A concentração de NO3- nos poços rasos variou...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Aquífero; Águas subterrâneas; Pesticida; Poço; Agricultura; Contaminação; Pesticides; Wells; Agriculture; Aquifers; Groundwater contamination.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1078921
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Evolution, present status and issues concerning small tank systems in Sri Lanka [Small tanks in Sri Lanka: evolution, present status and issues] AgEcon
Panabokke, Christopher Rajendra; Sakthivadivel, Ramasamy; Dias Weerasinghe, Asoka.
Tipo: Book Palavras-chave: Tank irrigation; Small scale systems; History; Irrigation systems; Design; Maintenance; Hydrology; Pollution; Irrigation management; Cultivation; Farming systems; Wells; Crop Production/Industries; Farm Management.
Ano: 2002 URL: http://purl.umn.edu/113505
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Groundwater markets and water use efficiency: The case of Karnataka AgEcon
Deepak, S.C.; Chandrakanth, Mysore G.; Nagaraj, N..
Research highlight based on a paper titled “Groundwater markets promoting efficiency in water use in agriculture in Karnataka.”
Tipo: Report Palavras-chave: Water market; Groundwater extraction; Water use efficiency; Wells; Crop production; Irrigation water; Domestic water; Pricing; Models; Policy; India; Karnataka; Demand and Price Analysis; Environmental Economics and Policy; Food Security and Poverty; Productivity Analysis.
Ano: 2005 URL: http://purl.umn.edu/53070
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Groundwater pollution and emerging environmental challenges of industrial effluent irrigation in Mettupalayam Taluk, Tamil Nadu AgEcon
Mukherjee, Sacchidananda; Nelliyat, Prakash.
Industrial disposal of effluents on land and the subsequent pollution of groundwater and soil of surrounding farmlands – is a relatively new area of research. The environmental and socioeconomic aspects of industrial effluent irrigation have not been studied as extensively as domestic sewage based irrigation practices, at least for a developing country like India. The disposal of effluents on land has become a regular practice for some industries. Industries located in Mettupalayam Taluk, Tamil Nadu, dispose their effluents on land, and the farmers of the adjacent farmlands have complained that their shallow open wells get polluted and also the salt content of the soil has started building up slowly. This study attempts to capture the environmental and...
Tipo: Working or Discussion Paper Palavras-chave: Groundwater; Water pollution; Income; Water quality; Irrigation water; Effluents; Wells; Drinking water; Domestic water; Households; Soil salinity; Crop management; Agricultural and Food Policy; Crop Production/Industries; Resource /Energy Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/91902
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Irrigation sector in Sri Lanka: Recent investment trends and the development path ahead AgEcon
Kikuchi, Masao; Barker, Randolph; Weligamage, Parakrama; Samad, Madar.
Increasing the area under irrigation and the widespread adoption of seed-fertilizer technology were the major factors that contributed to enhanced rice production in Sri Lanka, enabling the country to achieve self-sufficiency in rice. In recent years, there has been a shift in emphasis from expanding the irrigated land base to enhancing the productivity of irrigated land through diversification of agriculture and improvement of rice production, with better water management in irrigation schemes. This report attempts to assess how the irrigation sector in Sri Lanka is adapting itself to these new challenges. It analyzes the future direction of irrigation in Sri Lanka in light of recent trends in public and private investment in this sphere, and the...
Tipo: Report Palavras-chave: Irrigated farming; Public investment; Private investment; Cropping systems; Water management; Rehabilitation; Operating costs; Maintenance costs; Wells; Pumps; Agribusiness; Agricultural Finance; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Production Economics; Resource /Energy Economics and Policy.
Ano: 2002 URL: http://purl.umn.edu/44565
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IWRM and Food Security Project in Kafue Basin: Process Documentation AgEcon
Chisaka, Jonathan.
The purpose of this report is to show the process of the intervention made through the implementation of the IWRM and Food Security Demonstration Project in Zambia. The report gives details of the project processes, showing the steps the project went through, the outcomes and its impact on the communities where it was implemented. The report is the result of a number of field visits made to the completed project sites, the sources of information have been; focus group meetings, interviews, discussions with key informants, beneficiaries the youth, male and female stakeholders and reviews of project activity reports, and direct observations. Therefore, what is presented here is a cumulative “factual and real time” opinion as to what has been observed and...
Tipo: Report Palavras-chave: Water resource management; Project planning; Project management; Water storage; Pumping; Wells; Participatory management; Leadership; Water policy; Central government; Local government; Irrigation water; Zambia; Kafue River Basin; Katuba; Namwala; Chibombo; Agribusiness; Community; Rural; Urban Development; Crop Production; Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Institutional and Behavioral Economics; Land Economics; Land Use; Production Economics; Research and Development; Emerging Technologies; Research Methods; Statistical Methods; Resource; Energy Economics and Policy; Food Security and Poverty; Community involvement; Tech Change.
Ano: 2009 URL: http://purl.umn.edu/91805
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Planning groundwater use for sustainable rural development AgEcon
International Water Management Institute (IWMI).
Groundwater use is rapidly increasing in Sri Lanka, bringing several benefits to small farmers—by allowing them to grow more crops, minimize the impact of droughts, and profit from selling high-value produce. But how can this be sustained? Lessons learned from other countries with longer histories of groundwater use can help policymakers, planners, and development organizations avoid the pitfalls and dangers of indiscriminate use, and capture the benefits that groundwater can bring.
Tipo: Report Palavras-chave: Groundwater management; Rural development; Wells; Aquifers; Surface water; Conjunctive use; Irrigation water; Water pollution; Crop Production/Industries; Farm Management.
Ano: 2005 URL: http://purl.umn.edu/113019
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Recuperação de área desmatada de nascente e mata ciliar, em microbacia hidrográfica ocupada com atividade pecuária, na região de São Carlos, SP: Dificuldades e sugestões. Repositório Alice
PRIMAVESI, O.; CAMARGO, A. C. de; PRIMAVESI, A. C. P. de A..
1997
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Recuperação de vegetação; Mata ciliar; Nascentes; Espécies nativas; Restoring vegetation; Riparian forest; Wells; Native species; Código florestal.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/43725
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Robbing Yadullah’s water to irrigate Saeid’s garden: hydrology and water rights in a village of Central Iran AgEcon
Molle, Francois; Mamanpoush, Alireza; Miranzadeh, Mokhtar.
This report provides a case study from the province of Esfahan, in central Iran, describing the struggle of a village to secure the water resources without which local agriculture, and altogether life in the village, would be impossible. It illustrates the endless ingenuity of farmers in their quest for water, how land and water rights have developed, how various legal repertoires may conflict with one another, and how the intervention of the state transformed the wider hydrological cycle of the valley and affected the delicate equilibrium between population and resources that had prevailed until then. The report estimates the costs of accessing one cubic meter from each of these different sources and shows how political interventions or drought mitigation...
Tipo: Report Palavras-chave: Water allocation; Water rights; Irrigation management; Drought; Wells; Dams; Canals; Legal aspects; Villages; Iran; Zayandeh Rud Basin; Jalalabad; Najafabad; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Public Economics; Resource /Energy Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/53063
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Tsunami impacts on shallow groundwater and associated water supply on the East Coast of Sri Lanka: a post-tsunami well recovery support initiative and an assessment of groundwater salinity in three areas of Batticaloa and Ampara Districts AgEcon
Villholth, K.G.; Amerasinghe, Priyani H.; Jeyakumar, P.; Panabokke, Christopher Rajendra; Woolley, Olivia; Weerasinghe, M.D.; Amalraj, N.; Prathepaan, S.; Burgi, N.; Lionelrathne, D.M.D.S.; Indrajith, N.G.; Pathirana, S.R.K..
Tipo: Book Palavras-chave: Groundwater; Aquifers; Salinity; Natural disasters; Water supply; Drinking water; Wells; Rehabilitation; Mosquitoes; Disease vectors; Environmental Economics and Policy; Health Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2005 URL: http://purl.umn.edu/118303
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Water users association in XIth Branch Canal Periyar Vaigai Project: farmers experience AgEcon
Kannan, N..
Tipo: Book Palavras-chave: Water users associations; Farmer participation; Irrigation management; Privatization; Irrigation canals; Water distribution; Tank irrigation; Wells; Farm Management; Institutional and Behavioral Economics.
Ano: 1995 URL: http://purl.umn.edu/113613
Registros recuperados: 15
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